General Information:
Chemical Formula:
Tl3AsS4
Composition:
(Molecular Weight = 816.34 gm)
Thallium 75.11 % Tl
Arsenic 9.18 % As
Sulfur 15.71 % S
Empirical Formula:
Tl3AsS4
Environment:
Found in vugs with pyrite an other sulfide material of complex composition.
IMA Status:
Approved IMA
Locality:
Mercur gold deposit in the southern Oquirrh Mountains of Tooele County, Utah, USA.
Name Origin:
Fangite was named for Jen-Ho Fang in honor of his numerous contributions to crystallography, crystal chemistry, and geostatistics.
Physical Properties:
Cleavage:
[???] Indistinct
Color:
deep dark brown or red.
Density:
6.185
Diaphaniety:
Translucent
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Sub Metallic
Streak:
orange
More details...